Corrected result type for eigen inner_prod
Corrected result type for eigen inner_prod

ddemidov/amgcl,dondieselkopf/amgcl,dondieselkopf/amgcl,huahbo/amgcl,huahbo/amgcl,ddemidov/amgcl,ddemidov/amgcl,ddemidov/amgcl,huahbo/amgcl,dondieselkopf/amgcl